martin



J. E. MARTIN. Exhaust-Nozzle for- Locomotives.

y" a- L v F ERS, PHOTD-LITHOGRAPMER, wAsmNmou c L UNITED STATES PATENT OFFICE.

JOHN E. MARTIN, OF CONCEPCION, CHILI.

EXHAUST-NOZZLE FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 225,937, dated March 30, 1880.

Application filed May 12, 1879.

To all whom it may concern Be it known that I, JOHN EDINGTON MAR- TIN, a citizen of the United States, now residing at Concepcion, in the Republic of Chili, have invented certain new and useful Improvements in Exhaust-Nozzles or Blast-Pipes for Locomotives; and I do hereby declare that the following is a description thereof.

In the drawings, Figure l is a longitudinal vertical section through my improved exhaustnozzle. Fig. 2 is a similar section at right angles to the section of Fig. 1. Fig. 3 is a plan view of same.

My invention is to be applied to and used with the engine in the usual manner.

The invention consists in using two blastpipes or a double pipe combined with a larger single pipe, so that the double pipe discharges within the single pipe.

The construction is fully shown in the drawin gs.

A A is the double pipe, (or two pipes coupled together.) The lower ends of these pipes are connected to the exhaust-pipes, as usual. The upper end is secured to and discharges within the base of the single pipe B, which may have a reducer, C, at its mouth.

The drawings show proportions which are desirable and effective. Of course proportions will be varied to suit size of engine and duty to be performed.

The discharge-aperture of each part of the double nozzle A A may be four and a half inches, and that of the single nozzle B, say, six inches without reducer. The major diameter of single pipe B at its base, Where the double nozzle enters, will be over twice the major diameter of each part of the double nozzle A A. The area of the orifices at A A is of a size proportionate to their duty; that at B should be the same size or larger than those of A and A.

The improved blast-pipe is usually made in two parts for convenience of construction.

I am aware of the Letters Patent granted F. Espenshade, March 14, 1854,1"01' variable exhaust; also, of the Letters Patent granted R. H. Lecky, July 13, 1869, for spark-arrester; also, of the Letters Patent granted to T. S. Davis, December 29, 1868, for exhaust-valve; and do not claim anything shown in either of said Letters Patent.

The advantages of my invention are, first, the steam will not blow over from one cyliir der to the other and produce back-pressure, as in the single form of nozzle; second, the effect of the blast on the fire is very mild, being much milder than with the ordinary single or double form; third, the vacuum in the smoke-boxbeing constant and very low, the locomotive will throw little or no burning coal from the stack, even with heavy trains, and, as a consequence, spark-arresting apparatus is not required; fourth. on account of the mild effect of the blast on the fire a longer period of time is given the gases to become more perfectly consumed in the fire-box and the evaporation of water per pound of fuel is greatly increased; fifth, by dispensing with sparkarresters and other obstructions to the draft much larger exhaust-nozzles can be used, the exhaustion of steam from the cylinder being made perfect, or nearly so, and the power of the locomotive much increased; sixth, by decreasing the quantity of ci 1] ders drawn through the tubes and thrown against the sides of the fire-box (and this is accomplished by a mild draft) the need of repairs to these parts is materially lessened.

What I claim as my invention is- The combination of the double blast-pipe A A with the single pipe B, constructed and arranged for operation substantially as and for the purposes set forth.

JOHN EDINGTON MARTIN.

In presence of- JAMES H. TURNBULL, M. D., JOHN SLATER. 

